Merge tag 'arm-soc/for-4.18/soc' of https://github.com/Broadcom/stblinux into next/soc

This pull request contains Broadcom ARM-based machine/platform files
changes for 4.18, please pull the following:

- Doug updates arch/arm/include/asm/cpuinfo.h such that this header file
can be used by both C and assembly code. This particular change will
also be included in a Sunxi pull request to support A83T SMP support.

- Doug also updates our DEBUG_LL routine to support newer chips such as
7278 which have a version 7 memory map which moves the registers from
physical address 0xf000_0000 down to 0x0800_0000. This requires us to
look up the processor MIDR and determine the base address from the
PERIPHBASE register.

- Florian updates the Brahma-B15 read-ahead cache implementation such
that it works on the Brahma-B53 CPUs, which also have an identical
read-ahead cache implementation, with a different set of offsets. He
also provides the Brahma-B15 MIDR definition such that it can be used by
other pieces of code in the future.

* tag 'arm-soc/for-4.18/soc' of https://github.com/Broadcom/stblinux:
  ARM: brcmstb: Add support for the V7 memory map
  ARM: add Broadcom Brahma-B15 main ID definition
  ARM: add Broadcom Brahma-B53 main ID definition
  ARM: Allow this header to be included by assembly files
  ARM: B15: Update to support Brahma-B53
Signed-off-by: Olof Johansson <olof@lixom.net>

arch/arm/include/asm/cputype.h

@@ -2,9 +2,6 @@
 #ifndef __ASM_ARM_CPUTYPE_H
 #define __ASM_ARM_CPUTYPE_H
 
-#include <linux/stringify.h>
-#include <linux/kernel.h>
-
 #define CPUID_ID	0
 #define CPUID_CACHETYPE	1
 #define CPUID_TCM	2
@@ -62,6 +59,7 @@
 	((mpidr >> (MPIDR_LEVEL_BITS * level)) & MPIDR_LEVEL_MASK)
 
 #define ARM_CPU_IMP_ARM			0x41
+#define ARM_CPU_IMP_BRCM		0x42
 #define ARM_CPU_IMP_DEC			0x44
 #define ARM_CPU_IMP_INTEL		0x69
 
@@ -79,6 +77,10 @@
 #define ARM_CPU_PART_CORTEX_A15		0x4100c0f0
 #define ARM_CPU_PART_MASK		0xff00fff0
 
+/* Broadcom implemented processors */
+#define ARM_CPU_PART_BRAHMA_B15		0x420000f0
+#define ARM_CPU_PART_BRAHMA_B53		0x42001000
+
 /* DEC implemented cores */
 #define ARM_CPU_PART_SA1100		0x4400a110
 
@@ -98,6 +100,11 @@
 /* Qualcomm implemented cores */
 #define ARM_CPU_PART_SCORPION		0x510002d0
 
+#ifndef __ASSEMBLY__
+
+#include <linux/stringify.h>
+#include <linux/kernel.h>
+
 extern unsigned int processor_id;
 
 #ifdef CONFIG_CPU_CP15
@@ -326,4 +333,6 @@ static inline int __attribute_const__ cpuid_feature_extract_field(u32 features,
 #define cpuid_feature_extract(reg, field) \
 	cpuid_feature_extract_field(read_cpuid_ext(reg), field)
 
+#endif /* __ASSEMBLY__ */
+
 #endif

arch/arm/include/debug/brcmstb.S

@@ -11,20 +11,25 @@
  * GNU General Public License for more details.
  */
 #include <linux/serial_reg.h>
+#include <asm/cputype.h>
 
 /* Physical register offset and virtual register offset */
 #define REG_PHYS_BASE		0xf0000000
+#define REG_PHYS_BASE_V7	0x08000000
 #define REG_VIRT_BASE		0xfc000000
 #define REG_PHYS_ADDR(x)	((x) + REG_PHYS_BASE)
+#define REG_PHYS_ADDR_V7(x)	((x) + REG_PHYS_BASE_V7)
 
 /* Product id can be read from here */
 #define SUN_TOP_CTRL_BASE	REG_PHYS_ADDR(0x404000)
+#define SUN_TOP_CTRL_BASE_V7	REG_PHYS_ADDR_V7(0x404000)
 
 #define UARTA_3390		REG_PHYS_ADDR(0x40a900)
 #define UARTA_7250		REG_PHYS_ADDR(0x40b400)
 #define UARTA_7260		REG_PHYS_ADDR(0x40c000)
 #define UARTA_7268		UARTA_7260
 #define UARTA_7271		UARTA_7268
+#define UARTA_7278		REG_PHYS_ADDR_V7(0x40c000)
 #define UARTA_7364		REG_PHYS_ADDR(0x40b000)
 #define UARTA_7366		UARTA_7364
 #define UARTA_74371		REG_PHYS_ADDR(0x406b00)
@@ -55,8 +60,21 @@
 		mov	\rv, #0			@ yes; record init is done
 		str	\rv, [\tmp]
 
+		/* Check for V7 memory map if B53 */
+		mrc	p15, 0, \rv, c0, c0, 0	@ get Main ID register
+		ldr	\rp, =ARM_CPU_PART_MASK
+		and	\rv, \rv, \rp
+		ldr	\rp, =ARM_CPU_PART_BRAHMA_B53	@ check for B53 CPU
+		cmp	\rv, \rp
+		bne	10f
+
+		/* if PERIPHBASE doesn't overlap REG_PHYS_BASE use V7 map */
+		mrc	p15, 1, \rv, c15, c3, 0	@ get PERIPHBASE from CBAR
+		ands	\rv, \rv, #REG_PHYS_BASE
+		ldreq	\rp, =SUN_TOP_CTRL_BASE_V7
+
 		/* Check SUN_TOP_CTRL base */
-		ldr	\rp, =SUN_TOP_CTRL_BASE	@ load SUN_TOP_CTRL PA
+10:		ldrne	\rp, =SUN_TOP_CTRL_BASE	@ load SUN_TOP_CTRL PA
 		ldr	\rv, [\rp, #0]		@ get register contents
 ARM_BE8(	rev	\rv, \rv )
 		and	\rv, \rv, #0xffffff00	@ strip revision bits [7:0]
@@ -72,6 +90,7 @@ ARM_BE8(	rev	\rv, \rv )
 27:		checkuart(\rp, \rv, 0x07437100, 74371)
 28:		checkuart(\rp, \rv, 0x74390000, 7439)
 29:		checkuart(\rp, \rv, 0x74450000, 7445)
+30:		checkuart(\rp, \rv, 0x72780000, 7278)
 
 		/* No valid UART found */
 90:		mov	\rp, #0

arch/arm/mm/cache-b15-rac.c

@@ -33,7 +33,10 @@ extern void v7_flush_kern_cache_all(void);
 #define  RAC_CPU_SHIFT			(8)
 #define  RACCFG_MASK			(0xff)
 #define RAC_CONFIG1_REG			(0x7c)
-#define RAC_FLUSH_REG			(0x80)
+/* Brahma-B15 is a quad-core only design */
+#define B15_RAC_FLUSH_REG		(0x80)
+/* Brahma-B53 is an octo-core design */
+#define B53_RAC_FLUSH_REG		(0x84)
 #define  FLUSH_RAC			(1 << 0)
 
 /* Bitmask to enable instruction and data prefetching with a 256-bytes stride */
@@ -52,6 +55,7 @@ static void __iomem *b15_rac_base;
 static DEFINE_SPINLOCK(rac_lock);
 
 static u32 rac_config0_reg;
+static u32 rac_flush_offset;
 
 /* Initialization flag to avoid checking for b15_rac_base, and to prevent
  * multi-platform kernels from crashing here as well.
@@ -70,14 +74,14 @@ static inline void __b15_rac_flush(void)
 {
 	u32 reg;
 
-	__raw_writel(FLUSH_RAC, b15_rac_base + RAC_FLUSH_REG);
+	__raw_writel(FLUSH_RAC, b15_rac_base + rac_flush_offset);
 	do {
 		/* This dmb() is required to force the Bus Interface Unit
 		 * to clean oustanding writes, and forces an idle cycle
 		 * to be inserted.
 		 */
 		dmb();
-		reg = __raw_readl(b15_rac_base + RAC_FLUSH_REG);
+		reg = __raw_readl(b15_rac_base + rac_flush_offset);
 	} while (reg & FLUSH_RAC);
 }
 
@@ -287,7 +291,7 @@ static struct syscore_ops b15_rac_syscore_ops = {
 
 static int __init b15_rac_init(void)
 {
-	struct device_node *dn;
+	struct device_node *dn, *cpu_dn;
 	int ret = 0, cpu;
 	u32 reg, en_mask = 0;
 
@@ -305,6 +309,24 @@ static int __init b15_rac_init(void)
 		goto out;
 	}
 
+	cpu_dn = of_get_cpu_node(0, NULL);
+	if (!cpu_dn) {
+		ret = -ENODEV;
+		goto out;
+	}
+
+	if (of_device_is_compatible(cpu_dn, "brcm,brahma-b15"))
+		rac_flush_offset = B15_RAC_FLUSH_REG;
+	else if (of_device_is_compatible(cpu_dn, "brcm,brahma-b53"))
+		rac_flush_offset = B53_RAC_FLUSH_REG;
+	else {
+		pr_err("Unsupported CPU\n");
+		of_node_put(cpu_dn);
+		ret = -EINVAL;
+		goto out;
+	}
+	of_node_put(cpu_dn);
+
 	ret = register_reboot_notifier(&b15_rac_reboot_nb);
 	if (ret) {
 		pr_err("failed to register reboot notifier\n");